IMPROVE. RadTreeView - add support for DataBindings of RadTreeNode

Resolution: The feature is duplicated with feedback item ADD. RadTreeView - add support for binding the checkboxes of the nodes to a field in the data
Here is the link to item:  http://feedback.telerik.com/Project/154/Feedback/Details/112624-add-radtreeview-add-support-for-binding-the-checkboxes-of-the-nodes-to-a-field. 

The images and SignStyle cannot be modified using Visual Style Builder.

FIX. RadTreeView - Collapse method of RadTreeNode throws an exception if uised afrer children are added

FIX. RadTreeView - the GradientStyle property of RadTreeNode is overriden by the theme, even though it is set locally
The first part of the issue, regarding RadTreeNode.BackColor is addressed.
There is no issue with the persistance of GradientStyle property. To persist the GradientStyle property you should set its value explicitly. Here is an example:
void radTreeView1_NodeFormatting(object sender, TreeNodeFormattingEventArgs e)
{
if (radTreeView1.SelectedNode != null)
{
if (e.Node == radTreeView1.SelectedNode)
{
e.NodeElement.BackColor = Color.Yellow;
e.NodeElement.BackColor2 = Color.White;
e.NodeElement.GradientStyle = Telerik.WinControls.GradientStyles.Linear;
e.NodeElement.DrawFill = true;
e.NodeElement.NumberOfColors = 2;
return;
}
}
e.NodeElement.ResetValue(LightVisualElement.BackColorProperty, Telerik.WinControls.ValueResetFlags.Local);
e.NodeElement.ResetValue(LightVisualElement.BackColor2Property, Telerik.WinControls.ValueResetFlags.Local);
e.NodeElement.ResetValue(LightVisualElement.GradientStyleProperty, Telerik.WinControls.ValueResetFlags.Local);
e.NodeElement.ResetValue(LightVisualElement.DrawFillProperty, Telerik.WinControls.ValueResetFlags.Local);
e.NodeElement.ResetValue(LightVisualElement.NumberOfColorsProperty, Telerik.WinControls.ValueResetFlags.Local);
}

To reproduce: Add a RadTreeView with hierarchical data. Select a node with hierarchy level > 0. Call the Clear method of the Nodes collection. Refill the tree, drag and drop a node, you will see that two nodes will be dropped since the previous node's Selected property is set to true. 

Workaround: private void DetachAllNodes(RadTreeNode parent) { this.CleanNode(parent); foreach (RadTreeNode node in parent.Nodes) { this.DetachAllNodes(node); } } private void CleanNode(RadTreeNode node) { node.Current = false; node.Selected = false; } foreach (RadTreeNode node in tree.Nodes) { this.DetachAllNodes(node); } tree.Nodes.Clear();

1. Create a new project and add empty RadTreeView when handling its Form.Load event.
2. Set its AutoSize property to true.
3. Run the project.

1. Create a new project with RadTreeView.
2. Add 30 nodes in a cycle on Form.Shown event.
3. Use BeginUpdate/EndUpdate methods when adding every single node. 
4. Set the SelectedNode property of RadTreeView every time.

1. Create a new project with RadTreeView.
2. When handling Form.Load event add two root nodes and several child nodes.
3. Run the project and vertical scrollbar will be visible when it is not needed.

I can type to select a node.  For example, if I click to select the Car node, then type "V", selection jumps to the "Van" node.  I can right-arrow to expand, then type "U" to select the "Useful" node.

Resolution: 
Added two new properties: KeyboardSearchEnabled and KeyboardSearchResetInterval. When set the KeyboardSearchEnabled property to true, user can navigate to an item by typing when RadTreeView is focused. You can set how long the user must wait before searching with the keyboard is reset using the KeyboardSearchResetInterval property. 

Event and Sort(IComparer) method.

I need to drop a simple plain text from a textbox into a Rad Treeview.
I just read the forum, I'm mixing OLE Drag & Drop and RadTreeView Drag & Drop. The Events seems to be right and they seems to work fine.
But I'm just having a problem with the Visual Indicators of the treeview:

When I drag a regular node inside the treeview, I can see that visual indicators (the target node is highlighted, I can see a line of dots showing the direction above or below the target node, or the "forbidden" cursor, etc).
And when I actually try to drag a simple text inside the treeview, I don't see any of those stuff.
I need the same visual behavior when dropping a simple text. I need to see the indicators and I don't know how to activate them.

We upgraded to Telerik.WinControls  2012.2.726.20

I tried adding a RadTreeNode as follows

RadTreeNode rtn1 = new RadTreeNode("C1");
rtn1.CheckType = CheckType.RadioButton;
rtn1.CheckState = Telerik.WinControls.Enumerations.ToggleState.On;
received an error when running.

To reproduce:

 myTree.TreeViewElement.Comparer = new TreeSort(myTree.TreeViewElement);

Work around: None

If user move on last node of the tree view and move the mouse downwards then "NodeMouseLeave" event does not get fired and if user move left side of the node then it's working fine.

Private Sub LoadTvObjectInApp()
 
        Dim objectInApps As IQueryable(Of ObjectInApp)
        objectInApps = _context.ObjectInApps.Where(Function(c) (c.ApplicatieCode = "zis") AndAlso Not (c.GroepNaam = "hulp" AndAlso c.IsSysteemObject = True))
        

I want (for some reason) make nodes in treeview checked in "one line" (i.e. in Nodes collection of any node - no more than one child could be checked). Also, latest (i.e. deepest) node should be selected.

In attached example (see Example.zip):
1. Check node "Node 19" (as a result - nodes "Node 1", "Node 18" and "Node 19" checked and "Node 19" is selected).
2. Uncheck node "Node 1". Should be - nodes "Node 18" and "Node 19" checked and "Node 19" is selected. As a result - exception arised (see text of exception in Exception.zip).

I suppose that it may be connected with "invisibility" of "Node 19" (I mean, if I make this actions with "Node 3" - it works fine).

It seems that when you try to collapse a node the application thread crashes. The exception seems to point pretty firmly at the Telerik control - when it is applying styles to a node?

I have implemented filtering in radtreeview by using following code in filter button click event:

rtvTaxReturnLines.filter=textFilter.text;

Note: here rtvTaxReturnLines is radtreeview name.

It filter the result by text given by user in textbox.But after filtering if we want to drag and drop some filter results from the treeview to gridview or within the treeview then it is not allowing dragdrop service in filtered result.

Allow setting the AutoExpand time of node when drag operation is performing.

Improve the TreeViewDragDropService extensibility by allowing replacing the default remove behavior with copy behavior.